forked from OSchip/llvm-project
148 lines
4.9 KiB
LLVM
148 lines
4.9 KiB
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128"
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define i32 @test_load_cast_combine_tbaa(float* %ptr) {
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; Ensure (cast (load (...))) -> (load (cast (...))) preserves TBAA.
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; CHECK-LABEL: @test_load_cast_combine_tbaa(
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; CHECK: load i32, i32* %{{.*}}, !tbaa !0
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entry:
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%l = load float, float* %ptr, !tbaa !0
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%c = bitcast float %l to i32
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ret i32 %c
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}
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define i32 @test_load_cast_combine_noalias(float* %ptr) {
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; Ensure (cast (load (...))) -> (load (cast (...))) preserves no-alias metadata.
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; CHECK-LABEL: @test_load_cast_combine_noalias(
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; CHECK: load i32, i32* %{{.*}}, !alias.scope !2, !noalias !1
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entry:
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%l = load float, float* %ptr, !alias.scope !2, !noalias !1
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%c = bitcast float %l to i32
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ret i32 %c
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}
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define float @test_load_cast_combine_range(i32* %ptr) {
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; Ensure (cast (load (...))) -> (load (cast (...))) drops range metadata. It
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; would be nice to preserve or update it somehow but this is hard when moving
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; between types.
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; CHECK-LABEL: @test_load_cast_combine_range(
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; CHECK: load float, float* %{{.*}}
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; CHECK-NOT: !range
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; CHECK: ret float
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entry:
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%l = load i32, i32* %ptr, !range !6
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%c = bitcast i32 %l to float
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ret float %c
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}
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define i32 @test_load_cast_combine_invariant(float* %ptr) {
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; Ensure (cast (load (...))) -> (load (cast (...))) preserves invariant metadata.
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; CHECK-LABEL: @test_load_cast_combine_invariant(
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; CHECK: load i32, i32* %{{.*}}, !invariant.load !3
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entry:
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%l = load float, float* %ptr, !invariant.load !3
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%c = bitcast float %l to i32
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ret i32 %c
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}
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define i32 @test_load_cast_combine_nontemporal(float* %ptr) {
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; Ensure (cast (load (...))) -> (load (cast (...))) preserves nontemporal
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; metadata.
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; CHECK-LABEL: @test_load_cast_combine_nontemporal(
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; CHECK: load i32, i32* %{{.*}}, !nontemporal !4
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entry:
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%l = load float, float* %ptr, !nontemporal !4
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%c = bitcast float %l to i32
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ret i32 %c
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}
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define i8* @test_load_cast_combine_align(i32** %ptr) {
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; Ensure (cast (load (...))) -> (load (cast (...))) preserves align
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; metadata.
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; CHECK-LABEL: @test_load_cast_combine_align(
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; CHECK: load i8*, i8** %{{.*}}, !align !5
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entry:
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%l = load i32*, i32** %ptr, !align !5
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%c = bitcast i32* %l to i8*
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ret i8* %c
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}
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define i8* @test_load_cast_combine_deref(i32** %ptr) {
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; Ensure (cast (load (...))) -> (load (cast (...))) preserves dereferenceable
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; metadata.
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; CHECK-LABEL: @test_load_cast_combine_deref(
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; CHECK: load i8*, i8** %{{.*}}, !dereferenceable !5
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entry:
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%l = load i32*, i32** %ptr, !dereferenceable !5
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%c = bitcast i32* %l to i8*
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ret i8* %c
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}
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define i8* @test_load_cast_combine_deref_or_null(i32** %ptr) {
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; Ensure (cast (load (...))) -> (load (cast (...))) preserves
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; dereferenceable_or_null metadata.
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; CHECK-LABEL: @test_load_cast_combine_deref_or_null(
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; CHECK: load i8*, i8** %{{.*}}, !dereferenceable_or_null !5
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entry:
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%l = load i32*, i32** %ptr, !dereferenceable_or_null !5
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%c = bitcast i32* %l to i8*
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ret i8* %c
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}
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define void @test_load_cast_combine_loop(float* %src, i32* %dst, i32 %n) {
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; Ensure (cast (load (...))) -> (load (cast (...))) preserves loop access
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; metadata.
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; CHECK-LABEL: @test_load_cast_combine_loop(
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; CHECK: load i32, i32* %{{.*}}, !llvm.mem.parallel_loop_access !1
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entry:
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br label %loop
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loop:
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%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
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%src.gep = getelementptr inbounds float, float* %src, i32 %i
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%dst.gep = getelementptr inbounds i32, i32* %dst, i32 %i
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%l = load float, float* %src.gep, !llvm.mem.parallel_loop_access !1
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%c = bitcast float %l to i32
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store i32 %c, i32* %dst.gep
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%i.next = add i32 %i, 1
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%cmp = icmp slt i32 %i.next, %n
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br i1 %cmp, label %loop, label %exit, !llvm.loop !1
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exit:
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ret void
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}
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define void @test_load_cast_combine_nonnull(float** %ptr) {
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; We can't preserve nonnull metadata when converting a load of a pointer to
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; a load of an integer. Instead, we translate it to range metadata.
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; FIXME: We should also transform range metadata back into nonnull metadata.
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; FIXME: This test is very fragile. If any LABEL lines are added after
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; this point, the test will fail, because this test depends on a metadata tuple,
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; which is always emitted at the end of the file. At some point, we should
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; consider an option to the IR printer to emit MD tuples after the function
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; that first uses them--this will allow us to refer to them like this and not
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; have the tests break. For now, this function must always come last in this
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; file, and no LABEL lines are to be added after this point.
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;
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; CHECK-LABEL: @test_load_cast_combine_nonnull(
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; CHECK: %[[V:.*]] = load i64, i64* %{{.*}}, !range ![[MD:[0-9]+]]
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; CHECK-NOT: !nonnull
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; CHECK: store i64 %[[V]], i64*
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entry:
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%p = load float*, float** %ptr, !nonnull !3
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%gep = getelementptr float*, float** %ptr, i32 42
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store float* %p, float** %gep
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ret void
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}
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; This is the metadata tuple that we reference above:
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; CHECK: ![[MD]] = !{i64 1, i64 0}
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!0 = !{ !1, !1, i64 0 }
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!1 = !{ !1 }
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!2 = !{ !2, !1 }
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!3 = !{ }
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!4 = !{ i32 1 }
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!5 = !{ i64 8 }
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!6 = !{ i32 0, i32 42 }
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